Compartment syndrome occurs when there is swelling inside a limb. The swelling causes pressure to build up and squeezes shut blood vessels and damages nerves. When the limb loses blood supply, it begins to ache. The ache increases to very severe pain. If compartment syndrome is not treated quickly, it can cause serious nerve and muscle damage and may lead to loss of the limb.
Compartment syndrome can happen if your child has a very bad injury such as a broken or crushed bone, a snake bite, a bad burn, or severe skin and tissue damage. It also can develop if a cast or wrapping is too tight. It happens most often in the arm or leg.